Equipped with intellectual feedback electric driving circuit board, this advanced 532nm 50mW green Laser Pointer3000mw diode module always gets the best protection of its internal green laser diode in continuous dot projection. In long term continuous dot alignment, the laser tube just keeps stable temperature, thus it just gains the best dot projection on all targeting surfaces.For the most important of all, 532nm 100mW green laser diode modules adopt adjustable focus design. When it is being pointed on different working surface at various working distance, according to easy screw of heat part of Ultra Powerful Laser Pointer module, it can just obtain different size of green reference dot. The adjustable focus design has just made this high powered laser diode module fulfill different level of accuracy and precision dot projection in all working occasions.In order to make sure of the best dot projection result, users should make full control of exact dot projecting distance. Usually the maximum dot alignment distance should not exceed 20 meters. At 10cm working distance, the green dot is only available at 0.3mm. However, when dot targeting distance is at 20 meters, the dot size is available at 6mm to 8mm. At the same time, users should be also cautious enough with powerful green laser radiation, thus this advanced industrial alignment 50mw Green Laser Pointer Pen dot can just obtain the most satisfied dot projection precisely and accurately.I had also purchased a previous version of a similar item from a company called New Trent. It's now called the New Trent Torch 5200mAh USB Port battery. It costs more than the Anker version, but is lighter and delivers more charges. It's very solid and reliable, and they've even thrown in a flashlight and laser pointer pen - which is also great in a blackout if you need to light your way or want to entertain your cats.A smaller option that can buy you some time in a power outage is the EC Technology Mini 2600mAh external battery pack with flashlight. You'll get about one full charge out of it before it needs to be recharged. It's handy, and small enough to keep in your pocket or purse for general use. You might see similar, if not identical versions of this at the checkout at any Duane Reade.You may have a version of this next item at your workplace. A UPS power backup. They're great because they can continue to run your computer for a while when the power is interrupted, which gives you time to save your work and shut down without damaging your hard drives or computer. But it's basically just a rechargeable battery, and they have gotten quite small over the years. This one looks like a power strip on steroids.